This means the full charge capacity has dropped to 92% of the design capacity. Just divide the Full charge capacity by the design capacity.ĭo that for the image above you’ll get 0.92. See below: How to Calculate Laptop Battery Wear from the Battery Reportīased on the two figures above you can calculate the actual battery wear of your battery. I’ll update this article if that’s the case.Īnyway, on another Lenovo laptop, the charge cycles are displayed properly. It could be due to the laptop being just two weeks old. On my ASUS laptop, the cycle count indicator is missing, probably due to some driver issues. Usually, a laptop battery should last a couple of hundred discharge cycles without dropping the full charge capacity too much (let’s say under 75% of the design capacity). This is not even possible in Windows because the operating system will shut down your device at a certain charge threshold in order to preserve the battery’s health. You don’t need to empty the battery from 100% down to 0% to count as a discharge cycle. So, four 25% discharges make up one discharge cycle (100%). This is the number of complete discharges of your laptop battery.Ī complete discharge is calculated by adding the percentages of each discharge. In the Installed batteries section of the powercfg battery report, there’s an interesting spec: cycle count. Due to manufacturing tolerances, it’s never the same as the listed capacity.Ĭheck Battery Charge Cycles and Health in Windows Full charge capacity – this is the actual capacity reported by the battery controller.Design capacity – this is the manufacturer’s specification for the battery, usually the same capacity listed on the product page, under technical specs.We care about the two reported battery capacities: Here you will see a bunch of details about the actual battery manufacturer, serial number, battery technology, and so on. Then comes the Installed batteries section.
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